I started hiding the aluminum heads more then thirty years ago because we grudge raced our cars. We fooled a LOT of folks and no one ever knew for sure we were using aftermarket heads. Including some Pontiac guys because they had never seen an aluminum Pontiac head.
You guys are forgetting, while many of us purists could spot a disguised aluminum head from twenty feet away, most Brand X guys couldn't tell you the difference from a D-port and a round port iron head. One of my buddies worked for a very good local performance (that built a lot of great running performance Pontiacs) machine shop many years ago and all the employees referred to round port heads as "ram air heads" to this day he still couldn't tell you the difference between a RAIV, SD or HO head without looking up the numbers. I continue the practice because I really don't like the way an aluminum head looks.
I doubt I'll fool anyone with the head below but didn't want to advertise the manufacturer. The head made close to 1100 HP naturally aspirated and the manufacturer had nothing to do with that performance other than supplying the raw casting.
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